massive compact halo object Comparison Table

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massive compact halo object comparison table

Subject has surface temperature has velocity has surface density has parallax has position on celestial sphere has symbol has radiation at surface has antonym has energy source has energy production has catalog has material has mass has synonym has definition has luminosity class

black dwarf greater than 1000 Kelvin determined from proper motion and radial velocity which depends on luminosity class from the point of view of Earth's orbit from the point of view of Earth d which is diffused out from the hotter core gravitational contraction and or fusion which takes place primarily within the core star catalog hydrogen, helium greater than 0.08 the sun's mass main sequence star The final stage in the evolution of a star of roughly 1 M_sun. It is a mass of cold, electron-degenerate gas, and can no longer radiate energy, because the whole star is in its lowest energy state. No black dwarfs have ever been observed. Also, an object (M < 0.085 M_sun) that is not massive enough to achieve nuclear chain reactions. V

black hole white hole hidden mass A gravitationally collapsed mass inside the Schwarzschild radius (q.v.), from which no light, matter, or signal of any kind can escape. A black hole occurs when the escape velocity of a body becomes the velocity of light (2GM / R = c²). If an object with the mass of the Sun had a radius of 2.5 km, it would be a black hole. Black holes represent one of the possible endpoints of stellar evolution for stars very much more massive than the Chandrasekhar limit.

brown dwarf greater than 1000 Kelvin determined from proper motion and radial velocity which depends on luminosity class from the point of view of Earth's orbit from the point of view of Earth d which is diffused out from the hotter core gravitational contraction and or fusion which takes place primarily within the core star catalog hydrogen, helium 1 to 8 percent of the Sun main sequence star A self-gravitating, self-luminous gaseous object which is not sufficiently massive to result in thermonuclear hydrogen fusion reactions in its core and cannot therefore be considered a star. Such objects are expected to have a mass less than 7% of the Sun's mass and represent a "missing link" between low-mass stars and gas giant planets like Jupiter (at 0.1% of the Sun's mass). V

neutron star greater than 1000 Kelvin determined from proper motion and radial velocity which depends on luminosity class from the point of view of Earth's orbit from the point of view of Earth which is diffused out from the hotter core gravitational contraction and or fusion which takes place primarily within the core star catalog hydrogen, helium greater than 0.08 the sun's mass hidden mass Remnant of a star after it has exploded as a supernova. Usually optically dim, a neutron star sends out regular or irregular radio emissions and is therefore also called a pulsar. The density of such a star may be unimaginably great although the diameter is generally around only 10 km; the gravitational and magnetic forces are correspondingly vast. It is called a neutron star because in such density, protons fuse with electrons to form neutrons, of which the star is almost entirely composed.

Subject	has surface temperature	has velocity	has surface density	has parallax	has position on celestial sphere	has symbol	has radiation at surface	has antonym	has energy source	has energy production	has catalog	has material	has mass	has synonym	has definition	has luminosity class
black dwarf	greater than 1000 Kelvin	determined from proper motion and radial velocity	which depends on luminosity class	from the point of view of Earth's orbit	from the point of view of Earth	d	which is diffused out from the hotter core		gravitational contraction and or fusion	which takes place primarily within the core	star catalog	hydrogen, helium	greater than 0.08 the sun's mass	main sequence star	The final stage in the evolution of a star of roughly 1 M_sun. It is a mass of cold, electron-degenerate gas, and can no longer radiate energy, because the whole star is in its lowest energy state. No black dwarfs have ever been observed. Also, an object (M < 0.085 M_sun) that is not massive enough to achieve nuclear chain reactions.	V
black hole								white hole						hidden mass	A gravitationally collapsed mass inside the Schwarzschild radius (q.v.), from which no light, matter, or signal of any kind can escape. A black hole occurs when the escape velocity of a body becomes the velocity of light (2GM / R = c²). If an object with the mass of the Sun had a radius of 2.5 km, it would be a black hole. Black holes represent one of the possible endpoints of stellar evolution for stars very much more massive than the Chandrasekhar limit.
brown dwarf	greater than 1000 Kelvin	determined from proper motion and radial velocity	which depends on luminosity class	from the point of view of Earth's orbit	from the point of view of Earth	d	which is diffused out from the hotter core		gravitational contraction and or fusion	which takes place primarily within the core	star catalog	hydrogen, helium	1 to 8 percent of the Sun	main sequence star	A self-gravitating, self-luminous gaseous object which is not sufficiently massive to result in thermonuclear hydrogen fusion reactions in its core and cannot therefore be considered a star. Such objects are expected to have a mass less than 7% of the Sun's mass and represent a "missing link" between low-mass stars and gas giant planets like Jupiter (at 0.1% of the Sun's mass).	V
neutron star	greater than 1000 Kelvin	determined from proper motion and radial velocity	which depends on luminosity class	from the point of view of Earth's orbit	from the point of view of Earth		which is diffused out from the hotter core		gravitational contraction and or fusion	which takes place primarily within the core	star catalog	hydrogen, helium	greater than 0.08 the sun's mass	hidden mass	Remnant of a star after it has exploded as a supernova. Usually optically dim, a neutron star sends out regular or irregular radio emissions and is therefore also called a pulsar. The density of such a star may be unimaginably great although the diameter is generally around only 10 km; the gravitational and magnetic forces are correspondingly vast. It is called a neutron star because in such density, protons fuse with electrons to form neutrons, of which the star is almost entirely composed.

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